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The xGen Stubby Y Adapter is provided as part of the xGen DNA Library Prep EZ and MC Kits. With the Stubby Y Adapter, Tru-Seq-compatible indexing primers are used to incorporate indexes by PCR.
Visit IDT's xGen NGS Adapters & Indexing Primers page to learn more about IDT adapters.
While Tru-Seq-compatible full-length Y adapters can be used with the xGen DNA Library Prep EZ and MC Kits to index libraries by ligation, the "UNI" specific kits are better suited because the P5/P7 library amplification primers are included.